Window load event is not firing

Add-ons Add-on Support
#1

I have a super simple extension to handle when the web page loads. This is what I have:

window.addEventListener(‘load’, pageLoaded);
function pageLoaded() {
alert(“winpicker pageLoaded() called…”);
}

alert(“winpicker extension 1.0 is loaded and running…”);

I do see the last alert box but not from pageLoaded. Any ideas, please?

UPDATE:
+++++++
I have specified “matches”: ["<all_urls>"]
in the manifest.json and tested many different pages. Only a handful of pages actually fire the page-loaded event! Most do not fire.

I tried clearing the browser cache, but it made no difference.
and I have not figured out why only certain pages trigger the event.

#2

Content scripts are by default injected after the page is loaded, so the event won’t fire if the code is executed after the page is already loaded.

See also:

To fix it, you can use “run_at” value “document_start”.

#3

hi thanks a lot for the pointer!
with run_at/document_start, many more sites “work” but not reliably,
whereas in Chrome, the extension worked (without run_at) in nearly all sites i tried.

notably, on engadget.com and news.yahoo.com,
extension script did not load at all on both chrome and firefox!

#4

The easiest solution would be:
Don’t use an event listener at all, because

#5

Right. When and if the script is loaded, the page has been loaded by design!

Is there a way to notify page-loaded event to another app running in the local machine? I’m running Kubuntu and thought of a simple text file but that’s not allowed. D-bus signal would be nice but probably not possible in javascript.